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Mar. Drugs 2013, 11(9), 3335-3349; doi:10.3390/md11093335

Pharmacological Studies of Tentacle Extract from the Jellyfish Cyanea capillata in Isolated Rat Aorta

1,*  and 1,*
1 Department of Marine Biotechnology, Faculty of Naval Medicine, Second Military Medical University, Shanghai 200433, China 2 Emergency Department, Navy General Hospital of PLA, Beijing 100048, China These authors contributed equally to this work.
* Authors to whom correspondence should be addressed.
Received: 3 July 2013 / Revised: 21 August 2013 / Accepted: 23 August 2013 / Published: 30 August 2013
(This article belongs to the Special Issue Cytogenetic and Molecular Effects of Marine Compounds)
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Our previous studies demonstrated that tentacle extract (TE) from the jellyfish, Cyanea capillata, could cause a dose-dependent increase of systolic blood pressure, which seemed to be the result of direct constriction of vascular smooth muscle (VSM). The aim of this study is to investigate whether TE could induce vasoconstriction in vitro and to explore its potential mechanism. Using isolated aorta rings, a direct contractile response of TE was verified, which showed that TE could induce concentration-dependent contractile responses in both endothelium-intact and -denuded aortas. Interestingly, the amplitude of contraction in the endothelium-denuded aorta was much stronger than that in the endothelium-intact one, implying that TE might also bring a weak functional relaxation in addition to vasoconstriction. Further drug intervention experiments indicated that the functional vasodilation might be mediated by nitric oxide, and that TE-induced vasoconstriction could be attributed to calcium influx via voltage-operated calcium channels (VOCCs) from the extracellular space, as well as sarcoplasmic reticulum (SR) Ca2+ release via the inositol 1,4,5-trisphosphate receptor (IP3R), leading to an increase in [Ca2+]c, instead of activation of the PLC/DAG/PKC pathway or the sympathetic nerve system.
Keywords: jellyfish; Cyanea capillata; tentacle extract; vasoconstriction; contractile response jellyfish; Cyanea capillata; tentacle extract; vasoconstriction; contractile response
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Wang, B.; Zhang, B.; Wang, Q.; Zhang, Z.; Nie, F.; Liu, G.; Zheng, J.; Xiao, L.; Zhang, L. Pharmacological Studies of Tentacle Extract from the Jellyfish Cyanea capillata in Isolated Rat Aorta. Mar. Drugs 2013, 11, 3335-3349.

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